Replace kbool with a truly free library

Description

Please replace kbool with truly free software. The website of the developer says:

"Notice kbool is GPL licensed, commercial use not allowed, see main page fro more info."

Aside from that being contradictive, the author states in detail:

"The code is written by Klaas Holwerda, it is free to use for non commercial open source projects licensed as GPL.
If you need a commercial license, contact me.- mail me ."

I therefore think there is no other solution than to replace it. Even if your bundled version is under a different license, you should not keep it. Most Linux distributions follow the rule of not bundling third party libraries in packages. They therefore need to un-bundle them and create additional packages.